ANSC 333 Exam 1
Temperature of testicles compared to the body - ANS-4-6 degrees C COOLER
Temperature of blood from heart - ANS-39 degrees C
Pampiniform plexus - ANS-Network of veins wrapped intimately with testicular artery
within the scrotum; absorbs heat from the arterial blood entering the testes; derived
from the testicular vein; increases surface area in order to exchange heat
Functions of the testicles - ANS-1. produce sperm
2. secrete sex hormones
3. deliver sperm
Arteries go ____ from the heart - ANS-away
Veins go ______ the heart - ANS-towards
ductus deferens (vas deferens) - ANS-tube that carries sperm from epididymis to
urethra; lays right on the pampiniform plexus
fasia - ANS-connective tissue that holds things together
cremaster muscle - ANS-striated muscle; elevates or suspends testes in short term
situations (ejaculations, flight/flight)
tunica dartos muscle - ANS-smooth muscle; pushes the testes upward toward the body
for warmth or relaxes to cool the testes in long term situations
vaginal cavity - ANS-the space that separates the visceral vaginal tunic from the parietal
vaginal tunic of the descended testicle; two membranes are pulled down with testicles
through the body to scrotum; allows for ease of movement
4 ways to achieve thermoregulation of testicles - ANS-1. dartos muscle
2. pampiniform plexus
3. sweat glands in scrotal skin
4. breathing harder
which thermoregulation method is indirect - ANS-breathing harder
, How do sweat glands help regulate testicular temperature - ANS-more glands here than
anywhere else on the body; sweating more allows more cooling off when it evaporates
with air current
How are the sweat glads of the scrotal skin controlled - ANS-thermosensitive neurons
send signals to the brain
How does breathing harder help regulate testicular temperature - ANS-heat expulsion
through the breath cools central blood temperature, making it easier to cool it down
when entering the testicles
criptorchid - ANS-testicles fail to descend
which type of criptorchidism means sterile - ANS-bilateral; if both testicles fail to
descend
which type of criptorchidism means fertile - ANS-unilateral; if one testicle fails to
descend; hereditary
inguinal ring - ANS-opening in abdominal cavity where testes descend into scrotal sac
of male fetus by 7 months gestation; closes behind the testicles
gubernaculum - ANS-Aids the descent of testes; connected to the testicles and bottom
of the body cavity; disappears once it has pulled the testicles into the scrotum; usually
during fetal life or right after birth
how do testicles become herniated - ANS-inguinal ring did not close, allowing small
intestine to enter the scrotal area
what species usually have a problem with testicular hernias - ANS-swine
pathway of sperm - ANS-testes, seminiferous tubules, rete, mediastinum, efferent ducts,
head/body/tail epididymis, vas deferens, ejaculatory duct, urethra
head of epididymis - ANS-fluid absorption occurs to increase the concentration of the
sperm
body of epididymis - ANS-acquire mobility
Temperature of testicles compared to the body - ANS-4-6 degrees C COOLER
Temperature of blood from heart - ANS-39 degrees C
Pampiniform plexus - ANS-Network of veins wrapped intimately with testicular artery
within the scrotum; absorbs heat from the arterial blood entering the testes; derived
from the testicular vein; increases surface area in order to exchange heat
Functions of the testicles - ANS-1. produce sperm
2. secrete sex hormones
3. deliver sperm
Arteries go ____ from the heart - ANS-away
Veins go ______ the heart - ANS-towards
ductus deferens (vas deferens) - ANS-tube that carries sperm from epididymis to
urethra; lays right on the pampiniform plexus
fasia - ANS-connective tissue that holds things together
cremaster muscle - ANS-striated muscle; elevates or suspends testes in short term
situations (ejaculations, flight/flight)
tunica dartos muscle - ANS-smooth muscle; pushes the testes upward toward the body
for warmth or relaxes to cool the testes in long term situations
vaginal cavity - ANS-the space that separates the visceral vaginal tunic from the parietal
vaginal tunic of the descended testicle; two membranes are pulled down with testicles
through the body to scrotum; allows for ease of movement
4 ways to achieve thermoregulation of testicles - ANS-1. dartos muscle
2. pampiniform plexus
3. sweat glands in scrotal skin
4. breathing harder
which thermoregulation method is indirect - ANS-breathing harder
, How do sweat glands help regulate testicular temperature - ANS-more glands here than
anywhere else on the body; sweating more allows more cooling off when it evaporates
with air current
How are the sweat glads of the scrotal skin controlled - ANS-thermosensitive neurons
send signals to the brain
How does breathing harder help regulate testicular temperature - ANS-heat expulsion
through the breath cools central blood temperature, making it easier to cool it down
when entering the testicles
criptorchid - ANS-testicles fail to descend
which type of criptorchidism means sterile - ANS-bilateral; if both testicles fail to
descend
which type of criptorchidism means fertile - ANS-unilateral; if one testicle fails to
descend; hereditary
inguinal ring - ANS-opening in abdominal cavity where testes descend into scrotal sac
of male fetus by 7 months gestation; closes behind the testicles
gubernaculum - ANS-Aids the descent of testes; connected to the testicles and bottom
of the body cavity; disappears once it has pulled the testicles into the scrotum; usually
during fetal life or right after birth
how do testicles become herniated - ANS-inguinal ring did not close, allowing small
intestine to enter the scrotal area
what species usually have a problem with testicular hernias - ANS-swine
pathway of sperm - ANS-testes, seminiferous tubules, rete, mediastinum, efferent ducts,
head/body/tail epididymis, vas deferens, ejaculatory duct, urethra
head of epididymis - ANS-fluid absorption occurs to increase the concentration of the
sperm
body of epididymis - ANS-acquire mobility
